APC AIS 3000 Installation Manual download pdf (Page 16)

8 AIS® 3000 & XR Battery Enclosure 10-40kVA, 400V, Operation Manual – 990-2259

Operation Modes

In a stand-alone installation, the UPS has four different operation modes. If the installation includes a

Maintenance Bypass Panel test mode will also be available.

Normal operation

During normal operation, the UPS converts mains power to conditioned power for the connected

load.

Battery operation

During battery operation, the UPS provides power to the connected load from its internal and (if

applicable) external batteries for a finite period. The UPS transfers to battery operation if the supply

of mains power fails, or is outside pre-defined limits.

Bypass operation (or static bypass operation)

Static bypass operation can either be obtained by user request or automatically, as the UPS will

switch into bypass operation if both the normal and battery operation modes are unavailable. During

static bypass operation, the mains power is sent through internal Radio Frequency Interference (RFI)

filters to the connected load, bypassing the internal power converters. The UPS transfers to bypass

operation following a command received via the display, or after a short or heavy overload on the

output of the UPS. Battery back-up is not available in bypass operation.

Mechanical bypass

In mechanical bypass, mains power is sent directly to the connected load through a mechanical

breaker, bypassing all internal UPS functions and filters. Mechanical bypass is obtained by the

operation of the mechanical bypass breaker lever located behind the front cover. Mechanical bypass

is a feature designed to keep the load supplied with mains power during maintenance of the UPS

power sections. All major maintenance operations can be performed with the UPS running in

mechanical bypass, and with the load being supplied directly with unconditioned mains power.

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APC AIS 3000 Installation Manual Page 16